Diaphragm-valve.



H. S. FOLKER.

DIAPHRAGM VALVE. APPLICATION mio AuG.4. |915.

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. ATTORNEY Patented N ov. 12, 1918.

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'The diaphl-ngips 1d Spased aww by mugs u be termed Aa neutral chamber s between the two diaphragme. The radial vente ut in thering u are in line and co-activvith radial vents in the Walls of the casing B, so that the chamber s is at all times open to the atmosphere.

a is a supply passage in the structure supporting the valve casing and it is connected with the chamber d by a supply port-c' by means of which fluid pressure may be sup; plied through the passage a into the chainber d. The passage Way a is controlled by a supply valve not shown.

A pipe n leads into the chamber g through a passage Way vii/ m in the head B of the "valve casing and the said pipe n is connected to a suitable venting valve not shown.

The operation of the structure Will new be described. v

The valve y' is assumed to be in its closed position as shown in Fig. l. When the controlling valve of the passage a lis opened, fluid iovvs through the passageway a and port c thereby exerting pressure in the chamber (Z. The fluid enters the restricted assage port e through the restricted passage Ways e and f into the chamber g, which be ing closed, will cause pressure to be exerted upon the face of the larger diaphragm z thereby holding the valve head j securely seated against the seat It. When the venting valve connected to the passage nis operated, the pressure is diminished in the chamber g to such a degree that the diierential of pressure on the diaphragm is such that the valve structure will be forced in the direction of the arrow X in F ig. l causing the restricted passage-Ways c and f to be closed by the head 0 oi the valve 0, thus causing the entire supply of fluid passing through the conduit a to enter thechamber Z to operate the mechanism contained therein. Further fluid pressure causes the nozzle l" to impinge against the valve O and to thus unseat the said valve thereby lowering the pressure in chamber g to the normal pressure of the atmosphere.

In the event that there should be a leak vthrouefh the diaphragm fi, then it is seen that the air in the chamber g will vent itself through the chamber s and ports ui and so that the diaphragme Will then operate in the same manner as though the chamber g purposely vented to the atmosphere as above described.

This is evident for the reason that any leakage ot the larger diaphragm )i either around its circumference or at the center or byiracturaWvill cause a iiow of fluid into the chamber s thence through ports and ito the atmosphere. lThen this leak age is L, f ,ater than the supply through the restricted port the pressure from the chamber g will be reduced and Will cause the valve to open as hereinbcfore described.

insane? vwhich is vented is supplied with uid'pres.

sure through a restricted air passage of fixed Vcapacity and much smaller than the valve which vents the chamber, so when the valve which vents the chamber is opened, the pressure in the chamber is reduced very rapidly.

'W hen all parts are in their normal position, the ventin valve is closed. lf this valve should lea more than the capacity of the restricted passage which supplies the chamber, it will reduce the .pressure insaid chamber thereby causing the train stop to operate. This action will also take place if, any of the pipes or ttings leading to this chamber should leak or be disconnected or damaged.

While the above described construction forms a positive and eicient instrument, it is to be vunderstood that details of construction may4 be changed without .departing from the spirit and scope of my invention.

l desire it also to be understood that the language used in the following claims is intended to cover all of the generic and s e ciiic features of the invention herein. escribed, and all statements of the scope of the invention which, as a matter of language, might be said -to fall therebetween.

Having now described my invention, what l claim as new and desire to secure by Letters Patent, is:

1. ln a valve mechanism, a. valve cham- 105 ber, a venting chamber, double diaphragmsV between the two chambers, an inlet passage to the lirst mentioned chamber and an outlet passage to the second mentioned chainber, said outlet passage controlled by. a 116 normally seated spring pressed valve, means supported by the diaphragm for opening said valve.

2. ln a valve mechanism, `a double diaphragm, a valve rigidly secured to and mov- 115 able with both membersof said double diaphragm, chambers on either side of the double diaphragm, said valve being pro-v vided Awith a restricted passage Way, to permit pressure to be exerted on the double i2@ diaphragm 'to normally leep said valve seated.

3. ln a valve mechanism, a double diaphragm supporting a valve structure, chambers on either side of the double diaphragm, 125 said valve being provided with a restricted passage-Way cdiinecting the two chambers, mean for closing said restricted passageu uen the valve is open.

fl. ln a valve mechanism, a double dial y waage? a a ix ave a' lei thereto a hr ma 1 v l itam r' venting valve, means for causing a difer- 15 ence of pressure on said diaphragrns to open eaeh of said valves.

In Witness whereof I have hereunto seiI my hand at the city of Granville, county 0I Butte, an State of California, this 9th day 2o of July, 1915.

HWARB S. In presence of-'- HARRY L. Romanian, Hoi/mn C. DOUGLAS. 

